The uses of Q345R pressure vessel steel plate supplied by katalor

Q345R steel is a pressure vessel special plate with a yield strength of 340MPa, which has good comprehensive mechanical properties and process properties. The content of phosphorus and sulfur is slightly lower than that of low-alloy high-strength steel plate Q345(16Mn) steel. In addition to the increase of tensile strength and elongation requirement than Q345 (16Mn) steel, it is also required to ensure impact toughness. It is currently the most widely used and most used pressure vessel special steel plate in China.

According to the new classification of GB 713-2008 steel plates for boilers and pressure vessels implemented on September 1, 2008, 16Mng and 16MnR, 19Mng are combined into Q345R. Q345R is a common low-alloy steel, which is commonly used in boiler pressure vessels. The delivery status is: hot-rolled or normalized, and it is a low-alloy steel. The performance is similar to that of Q345 (16Mn) (the yield strength of 16mm steel plate is more than 345Mpa), the tensile strength is between (510-640), the elongation is greater than 21%, and the zero-degree V-type impact energy is greater than 34J. Q345R process reference standard GB713-2008.

Q345R pressure vessel steel plate features:
Q345R steel plate is a special pressure vessel with a yield strength of 265-345MPa, which has good comprehensive mechanical properties and process properties. The content of phosphorus and sulfur is slightly lower than that of low-alloy high-strength steel plate Q345(16Mn) steel. In addition to the increase of tensile strength and elongation requirement than Q345 (16Mn) steel, it is also required to ensure impact toughness. It is currently the most widely used and most used pressure vessel special steel plate in China.

Q345R pressure vessel steel plate Note:
First, the operating conditions of the equipment (such as design pressure, design temperature, characteristics of the medium), the welding properties of the material, the hot and cold processing properties, the heat treatment, and the structure of the container must be considered.

Second, on the premise of satisfying the first article, consider economic rationality:
1. When the required steel plate thickness is less than 8mm, carbon steel plate (except multi-layer container) should be used between carbon steel and low alloy high-strength steel.
2. In the case of stiffness or structural design, ordinary carbon steel should be used as much as possible. In the case of strength design, steel plates such as Q235B, 20R (20g) and Q345R (16MnR) should be used in turn according to the restrictions on pressure, temperature and medium.
3. When the thickness of the required stainless steel is greater than 12mm, the structural forms such as lining, composite and surfacing should be used.
4. Stainless steel should not be used as heat-resistant steel with a design temperature of 500 degrees Celsius or less.
5. Pearlitic heat-resistant steel should not be used as heat-resistant steel with a design temperature of 350 degrees Celsius or less. When pearlitic heat-resistant steel must be used as heat-resistant steel or hydrogen-resistant, the variety and specifications of steel should be minimized and combined.

Third, Q345R steel plate with thickness greater than 60mm, the upper limit of carbon content can be increased to 0.22%.
4. Q545R steel plate can be added with yttrium, vanadium and titanium elements. The content should be filled in the quality certificate. The sum of the above three elements should be no more than 0.050%, 0.10% and 0.12% respectively.
chemical composition
Grade chemical element (mass fraction) /%
CSiMnCrNiMoNbVPSAlt
Q345R 0.200.551.20-1.600.0250.0150.020
Als can replace Alt, should be no less than 0.015%

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